thorny
adjective uk/ˈθɔː.ni/ us/ˈθɔːr.ni/
(PROBLEM/SUBJECT)
[ before noun ]棘手的，麻烦的
A thorny problem or subject is difficult to deal with.
the thorny issue of taxation 棘手的税收问题
(PLANT)
多刺的;带刺的
having thorns
a thorny rose bush 带刺的玫瑰丛